Kinesiology 3347A/B Lecture Notes - Lecture 6: Umbilical Cord, Neural Tube, Prenatal Development
3 Mar 2020
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Cephalocaudal pattern developing from head to toe. Proximodistal pattern developing from the centre of the body out. Why doesn"t the placenta allow the bloods to mix: blood types may be different baby would die. Weeks 10-18 neuronal proliferation pace of neural formation increases dramatically. Weeks 13-21 newly formed neurons migrate (as cell bodies) to parts of brain where they will stay permanently. Synapse connections form between neurons upon arrival at final destination. Female fetuses more sensitive to external stimulation and advance more rapidly in skeletal development. Males more vulnerable to all kinds of prenatal problems. Males more likely to be spontaneously aborted. Males more likely to have birth defects. Why: females have 2 x chromosomes, if one is lacking the other can make up for it. Week 25 fetuses respond to sounds and vibrations with heart rate changes, head turns, and body movements. Week 32 fetuses can distinguish between familiar and novel stimuli.
